Cryosurgical instrument with vent holes and method using same
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United States of America Patent
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-
Oct 19, 1993
Grant Date -
N/A
app pub date -
Sep 6, 1991
filing date -
Sep 6, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A closed end surgical cryoprobe instrument with probe shaft diameter of 3 millimeters or less is made to achieve and maintain freezing zone temperatures close to that of the liquid cryogenic refrigerant. Using sub-cooled liquid nitrogen at approximately -208.degree. C. freezing zone temperatures as low as -206.degree. C. can be achieved in under 1 minute. The liquid nitrogen supply tube is provided with a plurality of small vent holes to vent gas formed or present in the refrigerant supply tube to the return refrigerant flow channel. The vent holes also allow small amount of liquid nitrogen to vent into the return flow channel to further reduce the temperature differential between the sub-cooled liquid nitrogen supply and the counter-current flowing return refrigerant.
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